Stage version of "Umimachi diary", a story of a heartrending yet gentle family bond woven by sisters living in a town with a view of the sea; a fusion of theater and music. The eldest daughter, Sachi, is a steady person, the second daughter, Yoshino, who loves alcohol and is vulnerable to younger men, and the third daughter, Chika, who always goes at her own pace. The news of her father's death reaches the three people who lived in the Kamakura house left by her grandmother. And she will welcome a “half-sister” left by her father, who had been separated from her when she was young.